The mean is defined as the a. middle of the data set. b. range of the data set. c. number that shows up most often in a data set. d. average of a data set.

Apublic library wants to place 4 magazines and 9 books on each display shelf. the expressions 4s +9s represents the total number of items that will be displayed on s shelves. simplify this expression

Rockwell hardness of pins of a certain type is known to have a mean value of 50 and a standard deviation of 1.1. (round your answers to four decimal places.) (a) if the distribution is normal, what is the probability that the sample mean hardness for a random sample of 8 pins is at least 51?

1: 4 if the wew 35 surfboards at the beach how many were short boards?